A181015 Number of nX(n+4) binary matrices with rows and columns each in strictly increasing order as binary numbers and every 0 adjacent to a 1 and every 1 adjacent to a 0

0, 0, 0, 0, 0, 0, 85, 14885, 4279160, 2134653096, 2320636820510, 6138217538155860

Offset

1,7

Comments

Superdiagonal 4 of A181011

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for 7X11
..0..1..1..1..1..1..1..1..1..1..1....0..1..1..1..1..1..1..1..1..1..1
..1..0..0..0..0..0..0..0..0..0..0....1..0..0..0..0..0..0..0..0..0..0
..1..0..0..1..1..1..1..1..1..1..1....1..0..0..1..1..1..1..1..1..1..1
..1..0..1..0..0..0..0..1..1..1..1....1..0..1..0..0..0..0..0..0..1..1
..1..0..1..0..0..1..1..0..0..0..0....1..0..1..0..0..1..1..1..1..0..0
..1..0..1..0..0..1..1..0..0..1..1....1..0..1..0..1..0..0..1..1..0..1
..1..0..1..0..1..0..1..0..1..0..1....1..0..1..0..1..0..1..0..1..0..0

Crossrefs

Sequence in context: A011813 A006106 A015338 * A131750 A239269 A068749

Adjacent sequences: A181012 A181013 A181014 * A181016 A181017 A181018

Keyword

nonn

Author

R. H. Hardin Sep 30 2010

Status

approved